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A surge protector is an equipment that protects the machines against surges that comes from the source or inside the facility. Inside this device, there is a zinc oxide varistor, which allows the electric current to pass through it if only the voltage is greater than the rated. (mais…)

I believe everybody wants to save energy, so I will share some measures that I made years ago with my old CRT monitor 17 inches for different conditions:(for such measurements, I used a clamp ammeter and I considered power factor equal to 0.80) (mais…)

Electric shock is established when our body behaves as a part of the circuit, offering a way for the current pass. This way is the one which offers less resistance.

It can have many causes, such as: contact with wires or sources energized, insulation failure, nature disturbances, accidental energizing, maneuver mistakes, electric arc (arc usually comes with severe burns, due to large amount of heat released). (mais…)

A differential residual device (known as DR in Brazil) acts through according the difference between two variables (in our case, currents). There is a toroid inside the enclosure which has a coil for each input. Among these, there is also a auxiliary coil connected to a cut relay. (mais…)

A lot of things is spoken about economy in our bills provided by fluorescent lamps. They dissipate 80% less then tungsten ones (incandescents); so, tendency is to think that they’re friend of nature or more environmentally friendly.